"Water production from an independent operator’s south Texas well suddenly leaped from less than 60 to over 500 bbl/day. CSI Technologies was called to fix the problem. Analysis of the well’s completion and production logs revealed that water had broken through a small channel in the cemented annulus between the production zone and a water zone below. Initial injection tests indicated the channel was too small to effectively squeeze cement, so CSI designed and supervised execution of a HydroFIX treatment of crosslinked polymer followed by microfine cement. The treatment successfully reduced water production back to its original rate. "